http://www.shootingtimes.com/longgun_reviews/ST_r15andthe30rar_200905/index.htmlHere is a decent write up in Shooting Times. As is, the cartridge is about as interesting as any of the Remington super short magnums and will enjoy the same fate. Once it is wildcatted, say 6mm, 6.5 or maybe even 270 then you will see what the case is capable of.
Right now, DPMS is the only source for carriers, bolts, magazines and upper receivers that will work with this case. My guess is that it will have a short life unless DPMS makes those parts widely available.